i have no bootble cd or disk how i can install solaris 7

well, one way that is a little bit inpractical is to look for an installserver and a boot server that somebody else has setup (I currently don't know of any except my own which isn't setup for other subnets) and ask them to add you to their list of clients who are allowed to install from their server. If you have gotten setup like this then, you will need to do a 'stop A' and then boot net and should either install automatically or with the interactive interface - depending upon how they have it setup.